[llvm-bugs] [Bug 30959] New: Heterogeneous lookup for unique-key associative containers should not be unique

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https://llvm.org/bugs/show_bug.cgi?id=30959

            Bug ID: 30959
           Summary: Heterogeneous lookup for unique-key associative
                    containers should not be unique
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rs2740 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

It's valid for the heterogeneous version of {map,set}::{equal_range,count} to
be called with something that compares equivalent to more than one key in the
container; the only requirement is that the keys of the elements be suitably
partitioned with respect to the heterogeneous key. (The motivating example in
N3465 is about finding the range for with a particular family name in a
set<name_entry>.) Thus, these versions cannot call
__{equal_range,count}_unique.

See http://stackoverflow.com/q/40504836/2756719.

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